An alternative system could reward all stakeholders equitably, instead of just investors. The larger set of stakeholders include employees, customers, even members of the community that don't actively participate in the business (but they sure are affected by the business' success--witness traffic problems in Seattle caused largely by the growth of Microsoft and Amazon).
It's a brilliant trick the capitalist class has played on us (and apologies to those of you on the capital side--it's probably not your individual fault), to get us to believe that the only way to get competition and innovation is to take their money and give them all the profits.
Following your line of reasoning to conclusion, what incentive do I have to work if all my "needs" are provided already? Extrapolate that out to the rest of the population. Oh so now I am being forced to work? What motivation do I have to do a good job? What will happen, I'll get fired from the job? Who cares, all my 'needs' are already taken care of. By who? I don't know. Oh wait I do know, by NOBODY.
This communism bullshit has got to stop, it's just never going to fucking happen.
To answer your question, though, if everyone’s needs were actually met why should anyone work? Within the century we will be living in a world where a lot of our most basic needs can be fulfilled by fully autonomous machines. Who should benefit from this? A few trillionaires, while the rest toil their lives away? Or the majority, whose lives can all be improved?
Likely every country will answer that question for themselves. But I submit that a country where there are the better part of a million homeless people (including children) and a handful of space-faring billionaires and celebrities hardly has the moral authority to shake their fingers at the others.
How can you possibly know that? Answer: you can't.
Back in the 50s it was assumed we would have flying cars by now. Turns out we don't.
Dismissing my point with "well in 100 years.." is, to be blunt, a lazy, bullshit response.
More broadly speaking, any number of systems could compensate people for innovation and problem solving (note I don't think competition should be rewarded in its own right, and risk taking isn't necessary in many systems) by providing them an elevated quality of life. The main difference to our capitalist system today is that rather than trying to accumulate as much personal capital as possible, value created from innovation would only go to the individual as needed to incentivize them. The rest would go to improving the world and lives of the people around them. Of course this requires the individual have some agency in that improvement, which we find lacking in the Soviet Union or other failed communist states.
I'm sure for someone at his level of technical ability there are plenty companies that would offer him an internship that also don't actively make the world worse for many people, like facebook does. Or he could work to unionise and give more leverage to the workers at such companies, and then use that power to fight against some of facebooks more predatory business practices. Facebook, the company is nothing without it's developers, but the working class would not be nothing without facebook.
Honestly that entire interview just reveals how much of that poor guys thinking is already infected by the virus called capitalism. Accumulating personal wealth shouldn't be the end goal here. It's short-sighted and perpetuates the very system that created inequality and injustice in the first place.
Instead of focusing on personal gain, why not channel that energy into organizing and fighting for a more equitable and just system? Learn about alternatives to capitalism and push for systemic change that benefits everyone, not just a select few who manage to "take advantage of opportunities."
Capitalism thrives on people thinking they can get rich quick, while most end up struggling and the rich get richer. By pursuing this goal, you're just playing into that system. Focus on the greater good and work towards a future where everyone has a fair shot, not just the ones who keep up with AI or whatever the next tech trend will be for the growth imperative to exploit.